<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>SimpleEditor</title>
  <style>
    html,
    body {
      width: 100%;
      height: 100%;
      padding: 0;
      margin: 0;
      overflow: hidden;
    }
    .simple-editor-demo {
      width: 600px;
      height: 350px;
      margin: 50px auto;
    }
  </style>
</head>

<body>
  <div class="simple-editor-demo"></div>
</body>

</html>